Closure assembly that is laterally movable for selective locking

ABSTRACT

A surgical device comprising: a closure assembly including: (a) a movement unit including: a bar that moves in a direction of a prescribed motion; (b) a latch unit including: (i) a latch plate including a hook latch that selectively receives the bar, the latch plate being movable in the direction of the prescribed motion between (A) a lockable state where the hook latch is engageable by the bar of the movement unit, and (B) an unlockable state where the bar does not reach the hook latch or the hook latch is moved out of alignment with the prescribed motion so that the hook latch is not engaged by the bar; and (ii) a stop that restricts movement of the movement unit relative to the hook latch.

FIELD

The present teachings relate to a device with a movable member and aground member that are movable relative to each other and the deviceincludes a movement unit and a latch unit that when connected preventmovement of the movable member and the ground member relative to eachother, and specifically a closure assembly with a latch plate the islaterally movable between a lockable state and an unlockable state toselectively lock the closure assembly.

BACKGROUND

Generally, forceps may be utilized for laparoscopic surgery or opensurgery. The forceps may be used to control delicate movements inside apatient. These forceps may be used to grip an anatomical feature. Theforceps may include a gripping assembly or a cutting assembly. Theforceps may include electrical energy for use in the gripping assembly,the cutting assembly, or both. The forceps have a pair of opposedresilient jaws that are closed against each other or a cutting blade.The jaws of the forceps may be locked together so that the surgeon maylock the forceps on a feature of interest while the surgeon works on adifferent anatomical feature or uses a different instrument. Examples ofsome latches or forceps including locks may be found in U.S. Pat. Nos.5,104,397; 6,056,333; 6,247,733; 7,802,856; and 8,945,175 and U.S.patent Application Publication No.: 2013/0066317; 2014/0276795;2015/0331443; 2016/0051275 all of which are incorporated by referenceherein in their entirety for all purposes. During locking of the arms toeach other the user may have to regrip one or more times in order tolock the jaws together. Furthermore, during releasing the user may berequired to manipulate the jaws one or more times in order for the lockto release the jaws.

It would be attractive to have a device that is selectively movablebetween a lockable state and an unlockable state and a stop thatprevents a movement unit from contacting a latch unit when the latchunit is in the unlockable state. What is needed is a latch plate thatmoves in a direction of a prescribed motion of a movement unit so that adistance between the latch plate and the movement unit is too large tolock the latch plate to the movement unit. What is needed is a latchplate that is movable both laterally and longitudinally. It would beattractive to have a latch plate that is longitudinally movable toexpand and contract a bias member to assist in moving the latch unitbetween a locked state and an unlocked state or vice versa. What isneeded is a closure assembly that has a small packing space, includes aclosure assembly that entirely fits within a handle, or both.

SUMMARY

The disclosure meets one or more of the needs by providing: a closureassembly comprising a latch unit and a movement unit. The movement unitis connected to a movable member that moves along a prescribed path. Thelatch unit is connected to a ground member and the latch unit is movablerelative to the ground member. The latch unit includes a latch platethat is movable between a lockable state and an unlockable state. Thelatch unit includes a stop that restricts movement of the movement unitrelative to the hook latch.

The present teachings provide: a surgical device comprising: a closureassembly including: (a) a movement unit including: a bar that moves in adirection of a prescribed motion; (b) a latch unit including: (i) alatch plate including a hook latch that selectively receives the bar,the latch plate being movable in the direction of the prescribed motionbetween (A) a lockable state where the hook latch is engageable by thebar of the movement unit, and (B) an unlockable state where the bar doesnot reach the hook latch or the hook latch is moved out of alignmentwith the prescribed motion so that the hook latch is not engaged by thebar; and (ii) a stop that restricts movement of the movement unitrelative to the hook latch.

The teachings herein provide a device that is selectively movablebetween a lockable state and an unlockable state and a stop thatprevents a movement unit from contacting a latch unit when the latchunit is in the unlockable state. The teachings herein provide a latchplate that moves in a direction of a prescribed motion of a movementunit so that a distance between the latch plate and the movement unit istoo large to lock the latch plate to the movement unit. The teachingsherein provide a latch plate that is movable both laterally andlongitudinally. The teachings herein provide a latch plate that islongitudinally movable to expand and contract a bias member to assist inmoving the latch unit between a locked state and an unlocked state orvice versa. The present teachings provide a closure assembly that has asmall packing space, includes a closure assembly that entirely fitswithin a handle, or both.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an electrosurgical device having alatching assembly;

FIG. 2 is a perspective view of an electrosurgical device having alatching assembly;

FIG. 3A is a close-up cross-sectional view of a movement unit and alatch unit in a lockable state;

FIG. 3B is a close-up cross-sectional view of a movement unit and alatch unit in a lockable state;

FIG. 4 is a close-up view of a movement unit and a latch unit and theprescribed motion of the movement unit;

FIG. 5A is a close-up view of a movement unit and a latch unit in alockable state;

FIG. 5B is a close-up view of a movement unit and a latch unit in anunlockable state with a portion the selection plate removed from thelatch unit;

FIG. 6A is a close-up view of the latch plate showing a pathway as a barmoves from an unlocked state to a locked state;

FIG. 6B is a close-up view of the latch plate showing a pathway as thebar moves from a locked state to an unlocked state;

FIG. 7A is a close-up view of the adjustment switch in the lockablestate; and

FIG. 7B is a close-up view of the adjustment switch in the unlockablestate.

DETAILED DESCRIPTION

The explanations and illustrations presented herein are intended toacquaint others skilled in the art with the teachings, its principles,and its practical application. Those skilled in the art may adapt andapply the teachings in its numerous forms, as may be best suited to therequirements of a particular use. Accordingly, the specific embodimentsof the present teachings as set forth are not intended as beingexhaustive or limiting of the teachings. The scope of the teachingsshould, therefore, be determined not with reference to the abovedescription, but should instead be determined with reference to theappended claims, along with the full scope of equivalents to which suchclaims are entitled. The disclosures of all articles and references,including patent applications and publications, are incorporated byreference for all purposes. Other combinations are also possible as willbe gleaned from the following claims, which are also hereby incorporatedby reference into this written description.

The present teachings relate to a closure assembly that connects two ormore members together and prevents movement of the two members relativeto each other. The closure assembly may connect a movable member to aground member or connect two movable members together. The closureassembly may prevent movement of a door (e.g., movable member) relativeto storage space (e.g., ground member). The closure assembly may be partof a hand-held device, pliers, clamps, or a combination thereof. Theclosure assembly may fit entirely within a hand piece, a housing, ahandle, or a combination thereof that fits within a hand of a user. Theclosure assembly may move from a first side of a hand piece, a housing,a handle, or a combination thereof to a second side. The closureassembly may be part of a drawer, cabinet, bin, a door, or a combinationthereof. Preferably, the closure assembly is part of a surgical deviceand prevents arms that control forceps from moving relative to eachother.

The present teachings relate to a surgical device. The surgical devicemay be a non-electrical device (i.e., may only provide mechanicalfunctions such as mechanical cutting or gripping). Preferably, thesurgical device is an electrosurgical device. The electrosurgical devicemay provide one or more therapy currents. Preferably, theelectrosurgical device provides two or more therapy currents (e.g.,monopolar power and bipolar power). A therapy current may pass betweenthe jaws (e.g., bipolar power). A therapy current may pass from a jaw toa blade or vice versa. A therapy current (e.g., monopolar power) maypass from a blade to a remote electrode (e.g., ground pad). Theelectrosurgical device may apply power before, after, or simultaneouslywith a mechanical technique (e.g., gripping or cutting). When power isapplied an anatomical feature may be cut, cauterized, sealed,coagulated, or a combination thereof. The electrosurgical device mayinclude a distal end and a proximal end. The distal end may include aportion of a forceps device (e.g., jaws, blade, or both). The distal endmay be a portion of the surgical device that is farthest from a user.The proximal end may be a portion a user grips (e.g., hand piece orhousing) or a portion closest to a user.

The present teachings provide a forceps device. The forceps may functionto grip an object. Preferably, the forceps may be used during surgery togrip a feature of interest including: a part of a body, an anatomicalfeature, tissue, veins, arteries, or a combination thereof. The forcepsmay assist in applying a therapy current to a feature of interest. Theforceps may move between a first position (e.g., release position) and asecond position (e.g., gripping position). The forceps may be fullyclosed in a full-pull position or partially closed in a partial pullposition. The forceps may function to be used in surgery, for examplelaparoscopic surgery. The forceps may be used with or without power. Atherapy current may be passed from one jaw to a second jaw when tissueis located between the jaws and the therapy current may coagulate blood,cauterize, cut, or a combination thereof. In another example, a therapycurrent may be passed from one or more of the jaws and/or a blade to aremote electrode (e.g., a return pad). The forceps may include a firstworking arm with a jaw and a second working arm with a jaw. The forcepsmay be comprised of parts needed to perform the recited functions andmay include generally, a stylet (e.g., a tubular member, a hollow tube,or an assembly of tubes), a hand piece, one or more operable mechanismsused to actuate the stylet, two or more jaws, two or more working arms,or a combination thereof.

The two or more working arms may function to move towards and away fromeach other to assist a user in gripping a feature of interest. The twoor more working arms may be directly biased towards each other by auser. Preferably, the two or more working arms are biased towards eachother by a stylet or tube moving over the arms (e.g., distally) so thatthe arms are moved together. The two or more working arms may be movedtowards each other by being retracted into a stylet or tube. The workingarms may be solid and rotate about a pivot. The working arms may be awire that is shaped to create a working arm, a jaw, or both. The workingarms may have one or more rods, one or more wires, or both that extendinto a stylet and connect to the hand piece. Each of the two or moreworking arms may include a jaw.

The two or more opposing jaws may function to create a gripping force,grip a feature of interest, or both. The two or more opposing jaws maymove towards each other to create a gripping force, to grip a feature ofinterest, or both. The two or more opposing jaws may function to be usedto grip or clamp an item of interest for cutting or applying a bipolarenergy source. Preferably, the two or more opposing jaws may be one jawstructure with another mirror image opposing jaw structure (i.e.,identical) that when forced together may create a gripping function. Thetwo opposing jaws may be any two or more structures that may be movablerelative to each other for perform a gripping function. The two opposingjaws may be any structures that may allow one jaw to be static and onejaw to be movable or any combination thereof. The jaws may be a grippingportion of a working arm. The two opposing jaws may be formed of twowires that are shaped to have a generally “U” shaped end. The twoopposing jaws may be made of any material so that the two opposing jawsmay be used to create a gripping force. The two opposing jaws may bemade of a flexible material, resilient material, rigid stainless steel,a plastically deformable material, an elastically deformable material,or a combination thereof. The two opposing jaws may be made of amaterial that conducts electricity. The two opposing jaws may include achannel (e.g., a blade track) to allow for a cutting instrument to beinserted while retaining functionality of the two or more opposing jaws.

The two opposing jaws may be used to apply electricity to a feature ofinterest that may be gripped by the two opposing jaws. The two opposingjaws may be a first jaw and a second jaw. The first jaw may be movablerelative to the second jaw, or vice versa. The first jaw and second jawmay be longitudinally movable relative to each other. Preferably, thefirst jaw and second jaw longitudinally move in unison. The first jawand second jaw may be longitudinally static. The first jaw and secondjaw may move about a pivot towards and away from each other. The twoopposing jaws may be moved between a release position and a retractposition by retraction of one of the one or more jaw shafts, movement ofthe one or more tubular members towards the distal end, or both along anaxis of the one or more tubular members; an application of force by auser; or a combination thereof. The two opposing jaws may have laterallyextending arcuate sections at the proximal end (e.g., heel of the jaw)of the jaws that protrude out from the distal end of the tubular member,while one or more jaw support rods extend into the tubular member. Aclosure assembly may lock the two opposing jaws together, lock the twoopposing jaws on tissue, lock the two opposing jaws on a blade, or acombination thereof.

The blade may function to cut a feature of interest. The blade may beany cutting tool that may be used in surgery, for example laparoscopicsurgery or open surgery. The blade may be any cutting device that may beextended and retracted through the stylet or between the first workingarm and the second working arm. The blade may extend along a stylet. Theblade may be made of any material that may be sharpened; is strongenough to cut a feature of interest; is biocompatible; that may conductelectricity; or a combination thereof. The blade may mechanically cut,electrically cut, or both. The blade may be substantially solid along alength of the blade. The blade may be sufficiently small so that theblade may be housed in the tubular member, tube, or both of a styletduring movement, insertion, or both. The blade may be extended into, andretracted from, the channel in the two opposing jaws. The distal end ofthe blade may have a shaped edge (e.g., sharpened). The blade may extendflush with or distal of the jaws. The blade may conduct power. The blademay conduct a therapy current. The blade may conduct bipolar energy,monopolar energy, or both. The proximal end of the blade may be attachedto a blade support rod. All or a portion of the blade may extend out ofthe stylet, between and past the jaws, or both to cut a feature ofinterest.

The stylet as discussed herein may include one or more tubular membersor may be a tubular member (i.e., tube). The stylet may be a neck thatconnects jaws, a blade, or both to a hand piece. The stylet may have ahollow cross-section, a solid cross-section, or both. The stylet mayinclude one or more tubes, one or more shafts, or both that may extendthrough the tubes. The stylet may include a tubular member and an innertube. The stylet may include a tube that extends around all or a portionof an inner tube. The stylet may be a hollow tube with one or moreshafts extending through the hollow tube. The stylet may function toextend into a patient during a surgical procedure so that a user (i.e.,surgeon) can perform one or more surgical procedures. The stylet may beflexible so that the stylet may be moved within a patient. Preferably,the stylet may be substantially rigid so that the stylet may be moved toa desired location. The stylet includes a distal end and a proximal end.The distal end may be an end of the stylet that is located farthest fromthe hand piece (e.g., the end of the stylet that is inserted into apatient). The proximal end of the stylet may be the end of the tubelocated proximate to the user, in the hand piece, or both. The styletand its components may be made of any biocompatible material, forexample, stainless steel, plastic, a synthetic material, a naturalmaterial, or a combination thereof. The tube sub-assembly may includeone or more tubes, one or mare inner tubes, one or mare outer tubes, oneor more gripping assemblies, one or more cutting assemblies, one or morerotation mechanisms, one or more operable mechanisms, one or morecamming shafts, one or more guides, one or more spacing members, one ormore jaw shafts, one or more blade shafts, or a combination thereof.Preferably, the stylet includes at least an outer tube that extend froma hand piece to a distal end.

The one or more outer tubes may function to close the jaws, bias thejaws, or both. The one or more outer tubes may function to house one ormore jaws, one or more blades, or both. The one or more outer tubes maybe axially static. The one or more outer tubes may axially move to openand close the jaws. The one or more jaws may move relative to the innertube. The one or more jaws may overrun the inner tube, the jaws, thearcuate sections, or a combination thereof to bias the jaws towards eachother. The one or more inner tubes may function to create a point ofcontact for one or more jaws. The one or more inner tubes may form aconnection point, include a connection feature (e.g., a pin, bolt,screw, rivet, or a combination thereof) for one or more jaws. The one ormore inner tubes may connect to a pivot joint of one or more jaws sothat the one or more jaws rotate about an axis. The one or more innertubes may be located distal of one or more tubes. The one or more innertubes may be part of a tubular member or a stylet. The one or more innertubes may be movable relative to an outer tube. The one or more innertubes may be axially movable, rotationally movable, or both relative toan outer tube, a camming shaft, or both. The one or more inner tubes maybe static and an outer tube may be movable relative to the inner tube.The one or more forceps may be free of any tubes or tubular members. Theone or more inner tubes, outer tubes, stylets, or a combination thereofmay form part of a fluid distribution system, connect a fluiddistribution system between a jaw, blade, or both and a hand piece. Theone outer tubes of the stylet may assist in connecting the jaws, theblade, or both to the hand piece.

The hand piece may be an assembly of parts or housing structures capableof forming a structure with a cavity that a user holds in theft hand.The hand piece may function to be gripped by a user. When gripped by auser a top or upper portion of the handpiece may be located up relativeto a user's hand and the bottom or lower portion may be located downrelative to a user's hand. Thus, up may include the one or more button,a region the stylet extends from, or both, and down may be where a cordextends out of the hand piece. The hand piece may function to hold orencapsulate one or more or a plurality of components of the surgicaldevice. The forceps may extend from the hand piece and may be actuatedby one or more operable mechanisms located within the hand piece. Theforceps may be actuated by direct pressure being applied to one or bothof the jaws that extend from the hand piece so that the jaws are movedtowards or away from each other (e.g., laterally moved). The forceps maybe actuated by movement of a trigger that is connected to the handpiece. The hand piece and the trigger may be biased apart. A bias devicemay extend between the hand piece and the trigger so that a gap islocated between the hand piece and the trigger. The hand piece and thetrigger may be biased apart. A bias device may extend between the handpiece and the trigger so that a gap is located between the hand pieceand the trigger. A bias device may be located along the stylet, withinthe hand piece, in communication with a part that axially moves so thatthe working arms are moved together, or a combination thereof. The biasdevice may be a bias device taught herein including those taught in U.S.Pat. No. 9,851,741 regarding a compression spring or element 90 or theteachings of U.S. Pat. No. 5,735,849 regarding a torsion spring orelement 80 the teachings of which are incorporated by reference hereinfor all purposes include those regarding how a moveable member is movedrelative to a ground member and especially how a trigger is movedrelative to a handle. The hand piece may be solid and the first workingarm and the second working arm, the first jaw and the second jaw, orboth may be biased apart by a bias member. The hand piece may includethe latch unit and the trigger may include the movement unit and whenthe movement unit and the latch unit are not connected together the biasmember may move the trigger to form the gap therebetween. A firstworking arm may include the latch unit and a second working arm mayinclude the movement unit. The forceps may create a sufficient grippingforce so that one or more features of interest (e.g., a patient's body)may be manipulated by the gripping assembly, secured by the grippingassembly, or a combination thereof. The forceps may grip and releasewhile being simultaneously rotated about the hand piece. The forceps maybe actuated by the actuation mechanism in communication with the forcepsor a user directly contacting the forceps. The hand piece may functionto form an enclosing structure for all or a portion of the forceps, agripping portion for the user, a main portion for manipulating theforceps, or a combination thereof. The hand piece may be any device thathouses all or a portion of the working assemblies and parts of theforceps. The hand piece may be comprised of one or more housingstructures. Preferably, the hand piece is two or more housingstructures. The housing structures may be two plastic pieces thatconnect together to enclose an open space that receives components ofthe surgical device. The hand piece may be any structure that is grippedby a user. The hand piece may be a ground member. The hand piece may bestatic. The hand piece may be a ground member that is static when a userapplies a pressure to so that a movable member is moved relative to theground member. The hand piece may assist in performing laparoscopicsurgery. The hand piece may be ergonomically shaped. The hand piece maybe used ambidextrously. The housing structures may form a cavity tohouse working assemblies of the forceps. The housing structures may beone or more housing structures and preferably two or more housingstructures. The housing structures may be any device that includes arecess for receiving one or more components of the forceps. The housingstructures may house all or a portion of one or more operablemechanisms, one or more valves, one or more fluid distribution systems,or a combination thereof. The housing structure may house all or aportion of an operable mechanism that causes the jaws to move, the bladeto move, the valve to open, the valve to close, all or a portion of afluid distribution system, or a combination thereof. The housingstructure may be made of one or more housings.

The one or more housings may function to form a hand piece, enclose aportion of an operable mechanism, enclose a portion of a stylet, encloseone or more tubes, or a combination thereof. The one or more housingsmay be a left half and a right half. The housing may be multiple piecesthat are connected together. The housing may be made of plastic. Thehousing may be a combination of plastic and metal. The housing mayprovide a stationary part (e.g., ground member) that a user grips whilea user moves a trigger (e.g., movable member) to actuate the forceps, ablade, or both. Preferably, the housing is connected to two or moretriggers that movably connect to the housing so that upon actuation thejaws, blade, fluid distribution system, or a combination thereof aremoved or actuated by one of the two or more triggers. More preferably,the triggers are movable relative to the housing to actuate the jaws,blade, fluid distribution system, or a combination thereof. The housingmay be connected to a first jaw, a second jaw, or both jaws of forcepsand a direct force may be applied to the housings in order to move theforceps towards or apart from each other. For example, upon a forcebeing applied to the housing the jaws may move towards each other. Inanother example, upon a force being applied to the housing the jaws maymove apart. The housing may be a proximal end (e.g., end closest to auser) and the jaws or blade may be the distal end (e.g., end farthestfrom a user). The jaws, blade, fluid distribution system, or acombination thereof may be moved between a first position (releaseposition) and a second position (retract position) by one or moreoperable mechanism or direct contact by a user. The housing may have aportion that is a handle that a user grips.

The handle may function to assist in actuation of the forceps, theblade, applying electricity, or a combination thereof. The handle may begripped by one hand. The handle may be part of the hand piece. Thehandle may include a lock, a lock plate, all or a portion of a closureassembly, a latch unit, or a combination thereof. The handle may be aproximal end of the surgical device. The handle may extend from a bodyportion or the hand piece. The handle may extend from an angle relativeto the body portion of the hand piece. The handle may be a static memberthat one or more triggers move relative to. The handle may be a groundmember that a movable member, a trigger, or both are movable relativeto.

The ground member may function to be static and another part (e.g., themovable member) may be moved relative to the ground member. The groundmember may form a coordinate system, a reference point for relativemotion of other components of the device taught herein, or a center of acoordinate system. The ground member may be connected to or located nextto a movable member and function to prevent movement of anothercomponent such as forceps or a blade as the movable member movesrelative to the ground member. The ground member may be part of a firstworking arm. The ground member may be a handle, a housing, a hand piece,a trigger, a jaw, or a combination thereof. Preferably, the groundmember is the handle or hand piece. The ground member may include all ora portion of a closure assembly. The ground member may include all ofthe latch unit. The ground member may receive a portion of a force toassist a movable member in being moved relative to the ground member.The ground member may receive a portion of the movable member to form alocked state.

The movable member may function to move relative to a ground member sothat the forceps or blade may be actuated, locked, released, or acombination thereof. The movable member may be biased apart from theground member (e.g., a bias device may be located between the movablemember and the ground member). The movable member may move with orrelative to a ground member to lock, unlock, bias, or a combinationthereof two or more jaws two or more working arms, a blade, or acombination thereof. The movable member may move to open and close thejaws, move the blade, or both. The movable member may be a trigger. Themovable member may be a cut trigger, a clamp trigger, or both. Themovable member may include all or a portion of the closure assembly. Themovable member may include the movement unit. The movable member mayrotate about a pivot so that the movement unit moves along movement path(e.g., prescribed motion). The movable member may be part of the closureassembly that assists in locking the jaws, the working arms, thesurgical device, or a combination thereof.

The closure assembly may function to connect a movable member and aground member together. The closure assembly may function to lock afirst working arm to a second working arm, a first jaw to a second jaw,a blade in an extended state or in a retraced state, or a combinationthereof. The closure assembly may be movable between a lockable stateand an unlockable state. The closure assembly may lock two itemstogether when the closure assembly is in a locked state. The closureassembly may freely move as the movable member, the ground member, orboth move relative to each other or are in an unlockable state. Aportion of the closure assembly may be located on or within the movablemember, the ground member, the movement unit, the latch unit, or acombination thereof. Preferably, the closure assembly includes amovement unit and a latch unit. More preferably, the closure assemblymay be part of a movable member and a ground member and the movablemember may be a trigger and the ground member may be a handle.

The one or more triggers function to be an input to an operablemechanism that moves one or both jaws, one or both working arms, one ormore blades, or a combination thereof. The one or more triggers mayfunction to be an input that directly moves one or more working arms, ablade, or both. The one or more triggers may be a movable member or aground member. Preferably, the triggers are a movable member and theground is a handle or hand piece. The one or more triggers as discussedherein may be a lever, handle, link, or a combination thereof. The oneor more triggers may be a cut trigger, a clamp trigger, an activationswitch, or a combination thereof that when actuated inputs movement intoan operable mechanism so that the operable mechanism provides an output.If the triggers are a lever, the lever is a rigid member that turns on apivot. The cut lever, the clamp lever, or both may function to move oneor more jaws, one or more blades, a jaw support rod, a blade supportrod, a second link, one or more valves, or a combination thereof. Thecut lever, the clamp lever, or both may extend between a releaseposition (e.g., a start position) and a retract position (e.g., a fullpull position where the jaws are closed, the blade is extended, orboth). The cut lever and the clamp lever may be individually biasedapart from the handle, the hand piece, or both. The cut lever, the clamplever, or both as they extend from a start position (or home position)to a full pull-position may close jaws, activate a functional element,extend a blade, or a combination thereof. For example, as the clamptrigger is moved, the clamp trigger may begin to close the jaws and asthe jaws close a closure assembly may simultaneously be closed such thatthe jaws are locked together. The one or more triggers may be part ofthe closure assembly, part of a movement unit, or both. Preferably, theone or more triggers carry the movement unit so that the movement unitwhen in communication with the latch unit may restrict movement of thetrigger.

The movement unit may be integrally connected to a movable member, atrigger, or both. The movement unit may extend from the movable membertowards the ground member and even into the ground member. The movementunit may move in a prescribed motion. The prescribed movement may be alinear motion, an arcuate movement, or a combination of both. Theprescribed motion may overlap in a first direction and a seconddirection. For example, the bar extending along the prescribed motion ina forward stroke is the same movement location when the bar extendsalong the prescribed motion in the return stroke. The movement unit mayrotate about a pivot so that the movement unit travels back and forthalong a constant path (e.g., a prescribed motion). The movement unit mayextend cantilever from a movable member, a trigger, or both. Themovement unit may extend into contact with a latch unit to form a lockedstate. The movement unit may move in relationship to the latch unit toform an unlocked state. The movement unit may move in a prescribedmotion at all times and the latch unit may move relative to the movementunit so that a lockable state, an unlockable state, a locked state, anunlocked state, or a combination thereof may be formed. The movementunit may include one or more bar arms, one or more bars, or both.

The one or more bar arms may function to extend from a movable member sothat a portion of the bar arm, the bar, or a combination thereof areextendable into a ground member, a latch unit, or both. The one or morebar arms may extend cantilever from the trigger, the movable member, orboth. The one or more bar arms may extend partially into the latch unit,a latching pathway, around a hook latch, or a combination thereof. Theone or more bar arms may be located at virtually any location on amovable member, a trigger, or both. Preferably, the one or more bar armsare located on a bottom of the movable member. The one or more bar armsmay be linear in shape. The one or more bar arms may be tapered. The oneor more bar arms may taper as the bar arms extend away from the movablemember and towards the ground member. The one or more bar arms may taperin shape so that once a sufficient amount of the bar arm extends intothe latch unit, the latching pathway, or both the one or more bar armsmay be prevented from extending further into the latch unit, thelatching pathway, or both. A distal end, narrowest region, taperedportion, end that extends into the latch unit, end that extends into thelatching pathway, or a combination thereof may include one or more bars.Preferably, the one or more bars may be located on a side of the bararm. More preferably, the one or more bars extend substantially normalfrom the bar arm.

The one or mare bars may function to connect the movement unit to thelatch unit so that movement of the movable member relative to the groundmember is prevented (e.g., create a locked state). The one or more barsmay move through a pathway to connect and release a closure assembly.Preferably, the one or more bars connect a movement unit to a latchunit. More preferably, the one or more bars connect to the hook latch toform a locked state. The one or more bars may be virtually any shape sothat the bars are movable through a latching pathway into the latch unitand then along a pathway to create a locked state and an unlocked state.The one or more bars may contact a hook latch to create a locked state.The one or more bars may be moved away from a hook latch to move alongthe pathway from a locked state to an unlocked state. The one or morebars may only extend along one side of the hook latch. Preferably, theone or more bars may circumnavigate the hook latch. The one or more barsmay be a projection that extends from the bar arm and ultimately from amovable member or a trigger so that when the bar is trapped the movablemember, the trigger, or both are prevented from being moved. The bar maybe cylindrical, cubical, a cone, a cuboid, or a combination thereof.Preferably, the bar is cylindrical so that the bar may extend through alatching pathway, into the latch unit, and around a pathway of the latchunit.

The latching pathway may function to receive the bar into the latchunit, the ground member, the housing, the handpiece, the handle, or acombination thereof. The latching pathway may be an opening in thehousing, hand piece, forceps, handle, or a combination thereof. Thelatching pathway is aligned within bar so that as the bar moves in aprescribed motion the bar will pass into and through the latchingpathway. The latching pathway may be an absence of material. Thelatching pathway may be part of the housing, handle, hand piece, or acombination thereof (e.g., a gap or spaced formed in the housing). Thelatching pathway may have one or more depths. The latching pathway maybe an internal structure or an external structure. The latching pathwaymay permit the bar to extend through a portion (e.g., the bar pathway).The latching pathway may permit a portion of the bar arm to extend intothe latching unit, the handle, or both (e.g., bar arm pathway). Thelatching pathway may have a height, width, length, or a combinationthereof that permits a locking arm to extend a predetermined distancealong the prescribed motion of the movable member. The bar arm pathwaymay be longer than the bar pathway. The bar pathway may have a thicknessthat is less than the bar pathway. The bar may not fit through the bararm pathway. The bar arm pathway may contact a portion of the bar arm torestrict movement of the movable member. The bar pathway may be a deeperportion of the bar arm pathway where the bar can extend through into thelatch unit. The latching pathway may permit ingress and egress of thelatch unit relative to the housing, the handle, hand piece, a stop, atrigger stop, an aperture, or a combination thereof. Preferably, thelatching pathway is located internal of an aperture.

The one or more apertures may function to protect a latching pathway,create a stop, create a trigger stop, form an opening in an externalwall of the housing, or a combination thereof. The one or more aperturesmay be an opening in the hand piece, housing, handle, or a combinationthereof. The aperture may permit the movement unit to extend into thelatch unit. The aperture may restrict movement of the movement unitrelative to the latch unit. The aperture may create a trigger stop thatcontacts the movable member, a trigger, the cut trigger, the clamptrigger, or a combination thereof. For example, the aperture may be atrigger stop when only a predetermined amount of a trigger may extendinto the aperture before the aperture contacts the trigger to restrictmovement.

The trigger stop may function to restrict motion of a movable member,trigger, of both relative to a ground member, a handle, or both. Thetrigger stop may restrict movement of the movement unit relative tolatch unit. The trigger stop may restrict movement of a bar along theprescribed path. The latching pathway may extend through the triggerstop. The trigger stop may be an outer wall of the hand piece, thehandle, the housing, or a combination thereof. The trigger stop may bean inner portion of the latching pathway where the bar arm contacts sothat movement is prevented. The trigger stop may be located at anylocation along the movable member, the ground member, or both.Preferably, the trigger stop is part of the ground member, handle, orboth. The trigger stop may be flush with the trigger, the movablemember, the ground member, the handle, or a combination thereof. Thetrigger stop may extend outward from the trigger, the movable member,the ground member, the handle, or a combination thereof. The triggerstop may be an internal wall located within the hand piece that contactsa portion of the bar arm as the bar arm travels along a prescribedmotion. The trigger stop may allow the bar to contact the latch unitwhen the latch unit is in the lockable state and to prevent the bar fromcontacting all or a portion of the latch unit when the latch unit is inthe unlockable state. The trigger stop may be located on the handle orthe trigger and restrict movement of the trigger relative to the handleso that when the hook latch, latch unit, or both are in the unlockablestate the handle bottoms out before the bar reaches the entry apex,extends around the entry apex, or both. The trigger stop may prevent atrigger from extending a sufficient distance to create a locked statewhen the latch unit is in the unlockable state.

The latch unit may function to create a connection with a movement unitso that the movable member and the ground member are locked together.The latch unit may retain a portion of the movement unit. The latch unitmay move as the movement unit moves along a prescribed path, an arcuatemovement, or both. For example, as the movement unit moves along theprescribed path the movement unit may move the latch unit so that thelatch unit and the movement unit are moved into a locked state, anunlocked state, or both. The latch unit may include a lockable state, anunlockable state, or both. The latch unit may be under a load (orpre-load) when the closure assembly is moved between or to a homeposition, a locked position, an unlocked position, a lockable state, anunlockable state, or a combination thereof. Preferably, the latch unitis free of a load when the latch unit is in the home position, the latchunit is free of contact with the movement unit, or both. The latch unitmay move along a longitudinal axis (e.g., all or a portion of the latchunit may move along the handle, the hand piece or both up and down asthe movement unit moves into contact with the hook latch or out ofcontact with the hook latch). The all or a portion of the latch unit maymove along a length of the handle. The latch unit may include one part.The latch unit may include one movable part. The latch unit may includeone unitary part that includes a bias member, a latch plate, hook latch,adjustment switch, and guide aperture. Preferably, the latch unitincludes a latch plate. More preferably, the latch unit is a singlepiece. The latch unit may be constrained within the handle by asidewall, a forward stop, a backward stop, an adjustment switch, aselection plate, a compression stop, a connection pin, a guide aperture,or a combination thereof.

The sidewall may function to restrict movement of the latch unit, thelatch plate, or both. The sidewall may restrict forward movement,rearward movement, downward movement, upward movement, or a combinationthereof. The sidewall may extend along all or a portion of the latchunit, the latch plate, or both. The sidewall may be part of the housing,the handle, the hand piece, or a combination thereof. The sidewall mayrestrict the latch unit so that the latch unit moves longitudinallyrelative to the handle. The sidewall may permit longitudinal movementbut may restrict lateral movement. The sidewall may be an internal wallwithin the housing, the handle, the hand piece, or a combinationthereof. The sidewall may have an external portion and an internalportion. The sidewall may be a trigger stop, a forward stop, a backwardstop, a compression stop, or a combination thereof.

The forward stop may function to restrict lateral movement of the latchplate, stop the latch plate in a lockable state, or both. The forwardstop may align the hook latch, the latch plate, or both with a latchingpathway. The forward stop may prevent motion of the hook latch so thathook latch at a distance where the latch unit and the movement unit areconnected together. The forward stop may include all or a portion of thelatching pathway. The forward stop may be an internal wall. The forwardstop may be an external wall. The forward stop may contact any portionof the latch plate so that lateral movement (e.g., in a directionparallel to the prescribed movement) of the latch plate is restricted orstopped. For example, the forward stop is located in a handle by thetrigger and a backward stop is located on an opposite wall of the handleand the lateral movement is between the forward stop and the backwardstop. The forward stop may restrict or prevent movement of the latchplate in a direction that is substantially perpendicular to thelongitudinal axis of the handle, the latch plate, or both (e.g., withinabout 10 degrees or less, or about 5 degrees or less). The forward stopmay include the latching pathway. The forward stop may be substantiallyparallel to the backward stop.

The backward stop may function to restrict lateral movement of the latchplate, stop the latch plate in an unlockable state, or both. Thebackward stop may stop the latch plate a distance from the latchingpathway so that the movement unit, the bar, or both cannot extend intocontact with the latch plate to create a locked state. The backward stopmay misalign the hook latch, the latch plate, or both with the latchingpathway. Preferably, the backward stop is located a sufficient distancefrom the forward stop so that when the latch plate is in contact withthe backward stop the bar cannot lock. More preferably, when the latchplate is in contact with the backward stop the bar cannot extend aroundan entry apex into the pocket. The rearward stop may be an internalwall. The rearward stop may be external wall. The rearward stop maycontact any portion of the latch plate so that lateral movement of thelatch plate is restricted or stopped. The rearward stop may restrict orprevent movement of the latch plate in a direction that is substantiallyperpendicular to the longitudinal axis of the handle, the latch plate,or both (e.g., within about 10 degrees or less, or about 5 degrees orless). The forward stop and the backward stop may prevent movement ofthe latch plate as the latch plate pivots about a connection pin.

The one or more connection pins function to connect the latch platewithin the latch unit. The one or more connection pins may function toguide the latch plate and assist in rotational movement of the latchplate. The one or more connection pins function to retain the latchplate within the handle while allowing the latch plate to rotate,laterally move, longitudinally move, or a combination thereof. The oneor more connection pins may function to assist the latch plate in movingbetween a lockable state and an unlockable state. The one or moreconnection pins may function to restrict movement of the latch plate.The one or more connection pins may guide the latch plate in thelongitudinal direction. The one or more connection pins may be part ofthe handle, the hand piece, the housing, or a combination thereof.Preferably, the connection pins are a single pin. The one or moreconnection pins may restrict movement of the latch plate in a firstdirection, a second direction, or both. The one or more connection pinsmay ground the latch plate to the handle, the housing, the hand piece,or a combination thereof. The one or more connection pins may beconnected to and extend from the latch plate into a guide aperture inthe housing, handle, hand piece, or a combination thereof. The one ormore connection pins may extend through a guide aperture.

The one or more guide apertures may function to receive a connectionpin, permit rotational movement of the latch plate, permit longitudinalmovement of the latch plate, permit lateral movement of the latch plate,or a combination thereof. The one or more guide apertures function toguide the latch plate. The guide apertures may guide the latch plate inmoving between a lockable state and an unlockable state. The one or moreguide apertures may be moved into contact with the connection pins asthe latch plate longitudinally moves, rotationally moves, laterallymoves, or a combination thereof. The one or more guide apertures mayhave a cross-sectional thickness (e.g., width or diameter) that issubstantially the same size as the cross-sectional thickness (e.g.,width or diameter) of the connection pins so that the latch plate movesalong the longitudinal axis of the handle, the latch plate, or both. Theguide apertures may be oval, round, have flat walls, have rounded ends,or a combination thereof. Preferably, the guide aperture is an elongatedslot. The guide aperture may allow a connection pin to travel to lockthe closure assembly. The guide aperture may be similarly sized to theconnection pin so that the communication between the guide aperture andthe connection pin restrict movement of the latch plate. A length of theguide aperture may determine an amount of movement of the latch plate.The length of the guide aperture allows movement of the hook latch fromthe home position. The guide apertures may allow the bias member toexpand and contract, elastically deform, or both. The guide aperturesmay restrict movement of a first end as the second end pivots between alockable state and an unlockable state. The one or more guide aperturesmay be part of the latch plate, the handle, the hand piece, the housing,or a combination thereof. The one or more guide apertures may contact aconnection pin to restrict movement of towards a compression stop, awayfrom a compression stop, or both.

The compression stop may function to prevent the bias member, the latchplate, or both from moving in a direction, from exiting the hand piece,exiting the handle, exiting the housing, or a combination thereof. Theone or more compression stops may restrict movement of one end of thebias member, the latch plate, or both. The one or more compression stopsmay function to retain an end of the bias member, the latch plate, orboth so that the bias member may be elongated, loaded, or both. The oneor more compression stops may assist in compressing the bias member forma home position to a compressed position so that energy, a load, or bothis stored within the bias member. The one or more compression stops maybe an internal wall or an external wall of the handle, the housing, thehand piece, or a combination thereof. The compression stop may have anaperture that extends along the switch path. The compression stop mayallow the latch plate to move along the switch path between a lockablestate and an unlockable state. The one or more compression stops mayretain the selection plate, adjustment switch, or both fromlongitudinally moving but permit the selection plate to laterally move,rotationally move, or both.

The selection plate may function to change the closure assembly betweena lockable state and an unlockable state. The selection plate may movealong a sliding axis, a switch path, or both to activate and deactivatethe closure assembly (e.g., change the latch unit between a lockablestate and an unlockable state). The selection plate may allow a user toenable and disable the closure assembly. The selection plate may besubstantially entirely located within the housing, hand piece, handle,or a combination thereof. The selection plate may be connected to thebias member, the latch plate, or both. The selection plate may have aportion located inside of the compression stop, a portion that extendsthrough the compression stop, and a portion that extends outside of thecompression stop. The selection plate may include an adjustment switchthat extends out of the housing, hand piece, handle, or a combinationthereof to permit movement by the user.

The adjustment switch may function to move the closure assembly,deactivate the closure assembly, activate the closure assembly, or acombination thereof. The adjustment switch may be exposed so that upon aforce being applied to the adjustment switch the state of the closureassembly is changed. The adjustment switch may be a thumb switch. Theadjustment switch may include one or more gripping portions. Theadjustment switch may contact the walls of the housing as the selectionplate moves so that a longitudinal distance of movement of the selectionplate is restricted. The adjustment switch may be movable along a switchpath. The switch path may be parallel to the sliding axis. Preferably,the switch path is perpendicular to the longitudinal axis of the handle,the latch plate, or both. The switch path and the sliding axis may becoplanar. The adjustment switch may move the selection plate so that thelatch plate is moved between the unlockable state and the lockable stateto change the function of the closure assembly (e.g., activate anddeactivate).

The unlockable state detent functions to allow free movement of themovable member and the ground member relative to each other by lockingthe position of the latch unit out of the path of the movement unit or adistance from the movement unit so that the movement unit cannot lock tothe ground unit. For example, when the selection plate is moved to belocked at the unlockable state detent the triggers may freely moverelative to the hand piece, the handle, the housing, or a combinationthereof. The unlockable state detent functions to lock the latch plate,the hook latch, or both out of alignment with or out of reach from thebar, the closure assembly, or both so that a lockable state is notcreated. The lockable state detent functions to restrict movement of themovable member and the ground member relative to each other by lockingthe position of the latch unit, the latch plate, the hook latch, or acombination thereof in the path of the movement unit. The unlockablestate detent function to move the latch plate, the hook latch, or both adistance away from the bar so that the bar cannot reach the hook latchto create a locked state. The unlockable state detent and the lockablestate detent (hereinafter detents) may lock the selection plate, thelatch plate, or both in a lockable state or an unlockable state. Thedetents may allow a user to select if the closure assembly is activated.The detents may allow a user to laterally move or rotationally move theadjustment switch between positions and lock the adjustment switch is adesired state. The detents may be a recess that receives a pin or a pinthat extends into a recess. The detents may prevent movement once astate is selected. The detents may be located within the housing, on thehandle, on the hand piece, or a combination thereof. Preferably, thehandle, the housing, the hand piece, or a combination thereof includetwo or more detents. The detents may positively receive a detent pin.The detents may be sinusoidal in shape. The detents may have two or morevalleys and each valley may be separated by a peak. Preferably, thedetents include at least three peaks with a valley between the threepeaks forming a lockable state detent and an unlockable state detent.Once the pin gets over the peak the pin may fall into a valley and lock.More preferably, the detents are a recess or valley located in thehousing, handle, hand piece, or a combination thereof. The detents mayassist in moving a pin into a locked state once the pin receives apredetermined point and if the pin does not reach the predeterminedstate then the pin returns to another detent until a stable state isobtained.

The detent pin functions to create a locked state, an unlocked state, orboth with the closure assembly. The detent pin functions to contact adetent and then lock the latch plate in a selected location. The detentpin may be a projection that extends into and is received by the detent.The detent pin may flex as the detent pin moves from one detent toanother detent. The detent pin may be connected to the bias member. Thebias member may flex to allow the detent pin to move between thelockable state and the unlockable state. The detent pin may be a pawl.The bias member may create a force that pushes the detent pin to theunlockable state detent, the lockable state detent, or both. The biasmember that biases the detent pin may be the same bias member thatbiases the hook latch. The detent pin may be static and the detents mayflex during movement of the selection plate. The detent pin when locatedwithin a detent the detent may restrict movement of the latch plateuntil a user acts upon an adjustment switch. The detent pin may be partof the housing, the handle, the hand piece, bias member, or acombination thereof. The detent pin may ground (e.g., prevent movementof) the closure assembly, the latch unit, the latch plate, or acombination thereof. The one or more detents may act as a stop; however,the closure assembly may include a rear stop, a forward stop, or both toconstrain movement of the selection plate relative to the latch plate orvice versa.

The one or more latch plates may function to move when a hook latch iscontacted by a bar so that a locked state, an unlocked state, or bothare created. The latch plate may carry one or more elements that formthe pathway (e.g., a path that a bar moves along as the bar moves from alocked state to an unlocked state). The latch plate may carry or includethe bias member, detent pin, the hook latch, the wall guide, guideaperture, connection pin, selection plate, adjustment switch, or acombination thereof. Preferably, the latch plate is an integral piecethat includes the bias member having a detent pin and an adjustmentswitch, a selection plate including a hook latch, wall guide, and guideaperture. The latch plate may rest in a home state and then movable onceacted upon by the movement unit. The latch plate may only move or bemovable when the latch unit is in a lockable state (e.g., during lockingor unlocking of the closure assembly or moving the closure assemblybetween a lockable state and an unlockable state). The latch plate mayonly move when biased by the movement unit. The latch plate may movealong the prescribed motion between the lockable state and theunlockable state. All or a portion of the latch plate may move in thedirection of the prescribed motion, along the prescribed motion, or bothbetween a first state (e.g., lockable state) and a second state (e.g.,unlockable state). The latch plate may include one or more detents, adetent pin, or both that assist in locking the latch plate in each state(e.g., the unlockable state, the lockable state, or both). The latchplate may move along the sliding axis, tracks, the hand piece, thehousing, or a combination thereof. The latch plate may move in alongitudinal direction, along a longitudinal axis, or both of the handpiece, the handle, the latch plate, or a combination thereof (e.g., thelatch plate path). The latch plate path may be a longitudinal movementof the latch plate up and down, toward and away from the home position,or both. Preferably, the latch plate path extends along the prescribedmotion of the bar. The latch plate may move between a forward stop and arearward stop in the housing along a latch plate path. The latch platemay longitudinally move as a bias member expands, contracts, or both.

The bias member may function to store energy when a force is applied tothe latch plate and then to release the energy when the force isremoved. The bias member may function to move the latch plate to a homeposition. The bias member may assist in locking or unlocking the movablemember and the around member. The bias member may be any material thatmay store energy. The bias member may be a double acting member. Forexample, a load of the bias member may be increased in a first directionand increased in a second direction. The home position may be a zeroload state or zero energy state. The first direction and the seconddirection may be relative to the home position. The biasing member mayact upon the housing, the hook latch, or both. The bias member may be adual acting member that acts on two members simultaneously. The biasmember may be free of a load when the bias member is in a home position.The bias member may be elastomeric, rubber, a spring steel, helical,round, cylindrical, or a combination thereof. The bias member may be apiece of rubber that is compressible, expandable, or both. Preferably,the bias member is a dual acting bias member. More preferably, the biasmember is a deformable body that includes a plurality of elasticallydeformable connections. The plurality of elastically deformableconnections may be connected to each other, movable relative to eachother, or both to store and release energy. The plurality of elasticallydeformable connections may be serpentine in shape, switch back andforth, be a plurality of “U” shaped members connected together, be aplurality of “C” shaped members connected together, or a combinationhereof. The bias member, the plurality of elastically deformableconnections, or both may be elastically deformable. Preferably, the biasmember is not a spring, helically wrapped, or both. The biasing membermay provide a bias between the hook latch and the housing. The biasmember when located within the latch unit and the latch unit being in ahome position may be free of any load. The bias member when expanded,contracted, or both may have a load. The bias member may increase inload as the bias member moves away from latch plate moves away from thehome position. A load on the bias member may be increased when the latchunit moves in a first direction, a second direction, or both relative toa home position of the latch unit. An increase in load or a change inload may be about 1 N or more, about 3 N or more, about 5 N or more,about 7 N or more, or about 10 N or more. The increase in load or thechange in load may be about 50 N or less, about 30 N or less, about 20 Nor less, or about 15 N or less. The change in load on the bias membermay exponentially increases as a distance of the latch unit form a homeposition increases. The change in load may be sufficiently large so thatthe bias member returns the latch unit back to the home position whenthe latch unit moves from a locked state to an unlocked state, in anunlockable state, a lockable state when the hook latch is not biased, ora combination thereof. The bias member may be a double acting biasmember. The bias member may bias towards the home position regardless ofwhether the bias member is biased in a first direction or a seconddirection. The bias member may be compressed, expanded, or both when thehook latch is contacted by the bar and the bar moves relative to thehook latch.

The hook latch may function to create the locked state. The hook latchmay function to catch the bar and prevent movement of the movable memberrelative to the ground member. The hook latch may have two sides ormore, three sides or more, or four sides or more. The hook latch mayhave a first side that assists in creating a locked state. The hooklatch may have a second side that assist in retaining a bar so that thelocked state is maintained. The hook latch may have a third side thatassists in creating an unlocked state. The hook latch may be generallytriangular in shape or may have a portion that is triangular in shape.The hook latch when contacted may longitudinally move the latch plate.The hook latch when contacted may move in a first direction that expandsor contracts the bias member from a home state so that a load is appliedto the bias member, energy is stored in the bias member, or both. Thehook latch when contacted may move in a second direction that expands orcontracts the bias member from a home state so that a load is applied tothe bias member, energy is stored in the bias member, or both.Preferably, the hook latch when moved in a first direction will expandthe bias member and when moved in a second direction will compress thebias member. The hook latch may include an angled portion, a linearportion, an entry apex, an entry portion, a return portion, an exitapex, pocket, or a combination thereof.

The one or more entry portions may function to assist in creating alocked state when the bar contacts the one or more entry portions. Allor a portion of the one or more entry portions may be aligned with thelatching pathway when the selection plate is in the lockable state. Theone or more entry portions may be mis-aligned with the latching pathwaywhen the selection plate is in the unlockable state. An end of the entryportion (e.g., entry apex) may be located a distance from the bar sothat the bar cannot extend to the end of the entry portion as the barmoves along the entry portion. The one or more entry portions may belocated a distance away from the bar when the entry portion is in theunlockable state so that the bar cannot contact the entry portion,extend a length of the entry portion, or both. The one or more entryportions may be an angled portion that may be angled so that all or aportion of the one or more angled portion extends across an opening ofthe latching pathway. The entry portion may extend perpendicular to alongitudinal axis of the handle, the latch plate, or both. Preferably,the entry portion extends at an angle of about 90 degrees or less, about75 degrees or less, about 60 degrees or less, about 45 degrees or less,or about 30 degrees or more relative to the longitudinal axis of thehandle, the latch plate, or both. The one or more entry portions mayextend in the path of the prescribed motion of the bar so that the barcontacts the entry portion. The entry portion may be angled so that asthe bar extends along the prescribed motion the bar is moved towards theentry apex and ultimately the pocket. The entry portion may have asufficiently small angle so that as the bar moves along the entryportion the latch plate is moved, compressing or extending the biasmember, by a force being exerted upon the entry portion of the hooklatch. The latch plate may continue to move as the bar travels along theentry portion until the bar reaches the entry apex. The entry portionmay terminate at an entry apex.

The entry apex may function to assist the bar in entering the pocket,leaving the entry portion, or both. The entry apex may be a part of thehook latch. The entry apex may prevent the bar from exiting the pocketfrom a same direction the bar entered the pocket. The entry apex may bewhere two walls converge together. The entry apex may be where the entryportion and the curved portion converge. The entry apex may be a pointwhere a bar may be required to be on a first side or a second side ofthe hook latch. The entry apex may create a lip at the pocket so thatthe bar cannot be back driven. When the bar passes the entry apex thebias member may release its stored energy so that the bar is moved intothe pocket. When the hook latch, the latch plate, or both are in theunlockable state the bar cannot reach the entry apex, the entry apex ismoved a distance from the movement unit so that the movement unit isfree of contact with the entry apex, or both. For example, when thelatch plate is moved to an unlockable state the bar cannot pass an entryapex of the hook latch to create a locked state. When the hook latch,the latch plate, or both are in the lockable state the bar may extendaround the entry apex into the pocket. The entry apex and an exit apexmay be located on opposing sides of the pocket, the curved wall, orboth.

The pocket may function to receive the bar so that a locked state isformed. The pocket functions to restrict movement of the bar. The pocketmay be a wall that the bar is biased against so that the bar isrestricted from being moved back into the latching pathway. The pocketmay be a curved portion of the hook latch. The pocket may be locatedproximate to the wall guide. The pocket may be a recess that the barresides within so that the locked state is formed and the bar is notinadvertently moved out of the pocket. The pocket may resist a biasingforce of the movable member away from the ground member. For example,the movable member may be biased away from the ground member and thepocket may resist the bar from exiting the pocket. In another example,the trigger may be biased apart from the hand piece by a bias device andthe bias device may assist in moving the bar into the pocket. The pocketmay resist a bias force in a lateral direction, a longitudinaldirection, or both. The pocket may resist the biasing member from movingto the home position. The pocket may prevent longitudinal movement,lateral movement, or both of the bar. The exit apex, the entry apex, orboth may extend beyond the pocket so that the bar remains within thepocket until a bias force of the movable member is resisted, a userregrips the movable member and the ground member together, or both. Uponregripping, resisting a bias force, or both the bar may exit the pocketby extending around the exit apex.

The exit apex may function to prevent a bar from inadvertently exitingthe pocket, the curved portion, or both. The exit apex may extend beyondthe pocket. The exit apex may be where the return portion and the curvedportion converge. The exit apex may be a point that once the bar extendsbeyond the bar cannot reenter the pocket. The bar may contact the exitapex while exiting so that the latch plate is biased, and upon the barstopping contact with the exit apex, the latch plate may bias away fromthe bar, to the home position, or both so that the prescribed motion ofthe bar is above the pocket and the bar cannot reenter the pocket. Theexit apex may be formed between the pocket and the return portion.

The return portion may function to guide the bar from the locked stateto an unlocked state. The return portion may function to guide the barto the latching pathway. The return portion may be located below theprescribed path when the latch plate is in the home position.Preferably, the return portion is located below an upper portion of thepathway when the hook latch is in the home position. The return portionmay be a linear portion. The return portion may be located above thelatch plate when the latch plate is in the home position. For example,the hook latch may block the latching pathway when the latch plate is inthe home position, and as the bar moves along a prescribed path the barmay contact the return portion of the hook latch and move the hook latchto open the latching pathway. For example, the bar may push the hooklatch down by contacting the return portion so that the release apex islocated below the latching pathway and the bar can exit the handle, thehand piece, the latch unit, housing, or a combination thereof. As thelatching pathway is being opened the bias device may be compresses anenergy stored within the bias device. Once the bar stops contacting thereturn portion (e.g., leaves the pathway) and reenters the latchingpathway the bias device may bias the latch plate back to a homeposition. The return portion may be moved into alignment with thelatching pathway when the bar moves along the pathway towards thelatching pathway.

The pathway may function to guide the bar from a home position to alocked position, from a locked position to an unlocked position, from anunlocked position to a home position, or a combination thereof. Thepathway may align with the latching pathway, the bar pathway, the bararm pathway, or a combination thereof. The pathway may be out ofalignment with the latching pathway. The pathway may assist a bar incircumnavigating a hook latch, the pathway may extend around the hooklatch, or both. The pathway may be tortuous. The pathway may be alabyrinth. The pathway may be an open area in the movement unit that thebar is guided through. The pathway may be an area between two or morewalls that a bar moves through, a bar moves along, or both. The pathwaymay be linear or have linear portions. The pathway may have curvedportions, arcuate portions, straight portions, extend 360 degrees, haveserpentine portions, or a combination thereof. The pathway may begin andend at a latching pathway. The pathway may extend along an entryportion, along a return portion, around an entry apex, into a pocket,around an exit apex, into a wall guide, around a guide apex, around arelease apex, along a rear wall, or a combination thereof. The pathwaymay assist the bar in moving along one or more walls of the hook latch.The pathway may assist the bar in moving the latch plate as the bar andthe hook latch contact each other. The pathway may be out of alignmentwith the hook latch, the wall guide, or both when the latch unit is inthe unlocked position, the unlocked state, the unlockable state, or acombination thereof. The pathway may extend between the hook latch andthe wall guide. The pathway may permit the bar to move around therelease apex of the hook latch, move into contact with the wall guide,or both.

The release apex may function to guide the bar into the pathway and outof the pathway. The release apex may align an entry end of the pathwaywith the latching pathway when the latch unit is in the lockable state,unlocked state, or both. The release apex may align an exit end of thepathway with the latching pathway when the latch unit is in the lockablestate, unlocked state, or both. The release apex may move from a firstside of a latching pathway to a second side of a latching pathway. Therelease apex may be located in an upper half of the latching pathwaywhen the hook latch is in the home state. The release apex may connectthe pathway to the latching pathway. The release apex may form a pointof the hook latch. The release apex may be a beginning and end of thehook latch. The release apex may be located opposite the pocket. Therelease apex may be located opposite the wall guide.

The one or more wall guides may function to assist the bar in movingfrom a locked position to an unlocked position, an unlocked position toa locked position, or both. The one or more wall guides may restrictmovement in a first direction (e.g., vertically, towards a forwardpost), in a vertical direction, or both when the bar is moving from anunlocked position to a locked position. The one or more wall guides mayassist a bar in extending around an entry apex, an exit apex, or both.The one or more wall guides may extend into the pathway to restrictmovement of the bar. The one or more wall guides may include a guideapex and a rear wall. The one or more wall guides may include a guidewall and a guide apex that extends into the pocket, towards the hooklatch, or both. The guide wall and the guide apex may direct the barinto the pocket when the bar extends around the entry apex.

The one or more guide walls may function to direct the bar towards orinto the pocket. The one or more guide walls may prevent the bar fromextending around the entry apex and the exit apex. The one or more guidewalls may extend parallel to the entry portion. The one or more guidewalls may extend from outside of the pocket to a location proximate tothe pocket. The guide wall may be linear. The guide wall may interruptthe pathway. The one or more guide walls may be located below the guideapex. The one or more guide walls may connection to the rear wallforming a guide apex.

The one or more guide apexes may function to prevent the bar from movingthrough the pocket without a locked state being formed, without the barbeing in the locked position, or both. The one or more guide apexes maydivide a pocket in half. The guide apex may be located between the entryapex and the exit apex. The guide apex may be substantially linear,angled downward, angled toward the entry apex, or both. The guide apexmay overlap the exit apex. For example, a mid-point extending betweenthe hook latch and the wall guide may be crossed by both the hook latchand the wall guide. The guide apex may interfere in the pathway so thatas the bar moves around the entry apex the bar may contact the guideapex so that when a trigger, a movable member, or both are released thebar moves the pocket. The guide apex may not contact the bar but mayguide the bar into contact with the exit apex so that the bar isretained within the pocket and a locked state is created. The guide apexmay be located under a rear wall. The guide apex may connect to the walland the rear wall may connect the guide apex to the wall.

The rear wall may function to guide the bar around the exit apex. Therear wall may extend at an angle relative to the guide apex. The rearwall may angle away from the exit apex towards a wall. The rear wall mayextend away from the exit apex. The rear wall may extend from a locationbelow the exit apex to a location above the exit apex. The rear wall mayguide the bar around the exit apex as a user applies a force to thetrigger, the movable member, or both so that the bar moves away from thepocket towards the rear wall. The rear wall may include one or morecurves. The rear wall may include a concave region, a convex region, orboth. The rear wall may guide the bar as the bar moves along aprescribed motion, an arcuate movement, or both.

The arcuate movement may function to move the bar from a home position,to a locked position, to an unlocked position, or a combination thereof.The arcuate movement may be an arcuate locking path, an arcuate releasepath, an arcuate trigger path, or a combination thereof. The arcuatemovement may travel a same path in a forward direction as a backwarddirection. The arcuate movement may be a movement of the bar, thetrigger, a movable member, or a combination thereof as the bar, thetrigger, a movable member, or a combination thereof rotate about apivot. The arcuate movement may be a prescribed movement of the bar, thetrigger, the movable member, or a combination thereof. The arcuatemovement may be the only movement the trigger, the bar, the movablemember, or a combination thereof makes. The arcuate movement may movethe bar from a home position to a locked position, a locked position toan unlocked position, and an unlocked position back to a home position.

The home position may be a position where the latch plate is at steadystate, the bar is not within the latch unit, or both. The home positionmay be a position where the bias member is free of compression. Thelatch plate in the home position may be at a zero load, zero force, orboth. The latch plate may move from a locked position to a home positionor vice versa, an unlocked position to a home position or vice versa, orboth. The home position may be where the hook latch crosses the latchingpathway. The home position may be where the bias member returns thelatch plate upon an engagement force or a disengagement force beingremoved. The home position may be where the movement unit and the latchunit are disconnected, can move relative to each other, or both. The barmay move from an unlocked position to a home position and be free of ahome position. The bar may move from a locked position to an unlockedposition and then to a home position.

The locked position may be where the bar is located within the pocketand the bar is prevented from moving by the hook latch. The lockedposition may be where the bar is located between the entry apex and theexit apex. The locked position may be where the movable member moves thebar back towards the hook latch so that the bar is retained in thepocket and the movable member is prevented from moving. The lockedposition may be the position where the bar prevents the movable member,a trigger, or both from moving. The locked position may be where thehook latch is aligned with the latching pathway. In the bar moving tothe locked position (e.g., a forward stroke), the bar may bias the hooklatch up or in a first direction (i.e., towards a forward post) as thebar enters the pathway. In the bar moving from the locked position(e.g., a return stroke), the bar may bias the hook latch down or in asecond direction, which is opposite the first direction as the bar exitsthe pathway. In the locked position, the hook latch may be moved by thebar as the bar moved along the arcuate movement, the pathway, or both.In the locked position, the bar may remain static and be prevented frommoving. The latch plate may be locked by the locked state detent whenthe latch unit is in the locked position. The locked position may belocated between two unlocked positions.

The unlocked position may function to allow the bar to move within thepathway. The unlocked position may be any position where the bar iswithin the pathway but not located within the pocket. The unlockedposition may be a bar in the pathway moving along the entry portion, thereturn portion, or both. The unlocked position may be where the bar isnot located between the entry apex and the exit apex. The bar may make alocking movement so that the bar changes from an unlocked position to alocked position.

The locking movement may be where the bar extends from an unlockedposition to a locked position. The locking movement may be where the barextends around an entry apex. The locking movement may be where the barmoves into contact with the guide apex and then upon release of thetrigger, the movable member, or both the bar is moved into the pocket,from the guide apex into the pocket, into contact with the exit apex butretained in the pocket, or a combination thereof. The locking movementmay be where the bar enters the pocket. As the bar makes a lockingmovement the bar may bias the bias member so that the bias member has aload. Once the bar completes the locking movement and moves into thepocket the bias member may retain some load The locking movement may befollowed by an unlocking movement where the bar is released from thepocket.

The unlocking movement may function to release the bar from the pocket.The unlocking movement may be a movement around the exit apex. Theunlocking movement may be a movement from the pocket to the wall guidewhere the wall guide assists in moving the bar around the exit apex, toa location above the exit apex, or both. The unlocking movement mayextend away from the hook latch and then back towards the hook latchonce the bar is above the exit apex. Once the bar extends around theexit apex the hook latch may move back to a home position where the hooklatch, bias device, or both have a zero load. The unlocking movement mayresult in the bar being in an unlocked state. An unlocking movement maymove the selection plate between a lockable state and an unlockablestate. The unlocking movement may be followed by a resetting movementwhere the bar is moved back to a starting position, the bar moves out ofthe latch unit, the trigger and handle move back to a home position, ora combination thereof. The resetting movement may function to reset thebar. The resetting movement may be a movement around the release apex,through the latching pathway, or both. The resetting movement may resultin the bar being in an unlocked state. The resetting movement may be amovement along the return portion of the hook latch, through thelatching pathway, or both. The resetting movement may be the bar movingalong a portion of an arcuate release path. A resetting movement maymove the selection plate between a lockable state and an unlockablestate. The resetting movement may bias the latch plate in a seconddirection so that the bar aligns with the latching pathway, can extendaround the release apex, or both. The unlocking movement may be followedby a resetting movement where the bar is moved towards the release apex,around the release apex, or both. The resetting movement may be amovement of the bar towards the latching pathway regardless of if thelatch unit is in the lockable state, the unlockable state, or both.

The unlockable state may be a state where the detent pin is locatedwithin the unlockable state detent. The unlockable state may function toprevent the closure assembly to be locked. The unlockable state may be astate where the latch unit is configured to be out of a movement path ofthe movement unit so that a locked state cannot be formed. Theunlockable state may be where the latch state is moved to a secondposition where the latch unit and the movement unit are not aligned, adistance is too great for the bar to travel to the pocket, or both.Preferably, the hook latch in the unlockable state maintains alignmentalong the prescribed path but the hook latch is moved a greater distancefrom the bar so that the bar cannot lock with the hook latch. Theunlockable state may be where the hook latch is mis-aligned with thelatching pathway so that as a bar extends into the latching pathway thebar and hook latch do not contact each other. In the unlockable statethe hook latch may be located entirely above or below the latchingpathway. The unlockable state may be a state where the detent pin islocated within the unlockable state detent. When the latch plate ismoved from the unlockable state detent to the lockable state detent theclosure assembly may change from the unlockable state to the lockablestate.

The lockable state may function to allow the closure assembly to belatched. The lockable state may be a state where the movement unit andthe latch unit are aligned and may connect together, may lock a movablemember to a ground member, or both. The lockable state may be where aportion of the hook latch is aligned with the latching pathway so thatas a bar extends through the latching pathway the bar can contact thehook latch to create a locked state. When the latch unit is in thelockable state the bar may extend around an entry apex into a pocket tocreate a locked state. In the lockable state, the bar may contact thehook latch and move the movement unit. The closure assembly, in thelockable state may have an unlocked state or a locked state. Theunlocked state may be where the movable member and the ground member aremovable relative to each other. The unlocked state may be where the baris not constrained by the latch unit. The unlocked state may be wherethe latch unit is not locked relative to the movement unit and the latchunit and the movement unit may move relative to each other. The unlockedstate may be where the latch plate is locked so that the bar extendsinto the pathway and is not constrained any members of the latch plate,the hook latch, or both. The unlocked state may allow a user to freelyopen and close the jaws without the jaws being locked in place. Thelatch plate, in the unlocked state, may be locked in a position so thatthe movable member and the ground member are unlocked. The unlockedstate may be where the latch unit is in a lockable state but the bar isnot located within the pocket so that the bar is movable relative to thehook latch. The bar in the unlocked state may be in contact with anypart of the hook latch except for the pocket. The latch unit may in alockable state and changed between a locked state and an unlocked state,the bar may be movable between a locked state and an unlocked state, orboth.

The locked state may function to lock the movable member and the groundmember together. The locked state may be where the closure assembly islocked. The locked state may be where the movement unit and the latchunit are connected together. The locked state may be where the latchunit is moved along the sliding axis and restrained by the bar. Thelocked state may be where the latch unit, the hook latch, or both aremovable by the movement unit to lock the movable member and the groundmember together. The locked state may be where the bar is located withina pocket. The locked state may be where the latch plate is restrictedfrom moving about a sliding axis by the bar.

The sliding axis may function to move the latch plate from a firstposition to a second position, along the track, up and down, parallel toa length of the handle, or a combination thereof. As the latch platemoves along the sliding axis compression of the bias member may beincreased, decreased, or a combination of both. The as the bar movesalong the hook latch, an engaging force may be applied to the hook latchthat moves the latch plate along the sliding axis.

The engaging force may function to move the latch plate along thesliding axis, to compress the bias member, to lock the closure assembly,to lock the movement unit to the latch unit, or a combination thereof.The engaging force may be sufficiently large to move the latch plate asthe bias member compresses or stretches. The engaging force may increaseas the bar moves along the hook latch. The engaging force may increaseas the bar moves from the release apex towards the entry apex. Theengaging force may increase as the bar moves along the return portion.The engaging force may increase as the bar moves from the exit apex tothe release apex. Preferably, the engaging force is along a first sideof the hook latch, along the entry portion, or both as the bar extendsfrom the latching pathway and the pathway and into the pocket. Theengaging force may be a single force that is generated by a user as thebar moves along a prescribed movement an arcuate movement, or both. Theuser may generate the engaging force by moving the movable member andthe ground member towards each other. The engaging force may besubstantially similar to an amount of force required for a disengagingforce.

The disengaging force may function to move the bar out of the pocket,around the exit apex, or both. The disengaging force may extend parallelto the engaging force. The disengaging force may have one or more forcesalong one or more different directions, vectors, or both. Thedisengaging force may remove a bar from the pocket and then remove thebar from the latch unit, the housing, the handle, the hand piece, or acombination thereof. The disengaging force may have a portion that isalong the exit apex, along the wall guide, along the return portion, ora combination thereof. The disengaging force may be created by aregripping and movement of the movable member relative to the groundmember. The disengaging force may first extend away from the hook latch,then up the rear wall, around the exit apex, and then along the returnportion where the latch plate is moved along the sliding axis. Thedisengaging force may have a first disengaging force where the bar ismoved out of the pocket and a second disengaging force where the bar isaligned with the latching pathway. The first disengaging force may movethe bar away from the pocket (i.e., a regrip of the movable member orthe trigger), up over the exit apex, or both. The first disengagingforce may guide the bar along a rear wall of the wall guide. The firstdisengaging force may release the closure assembly, move the closureassembly from a locked state to an unlocked state, or both. Once thebar, movement unit, or both are released the bar, movement unit, or bothmay change from a first disengagement force to a second disengagementforce. The second disengagement force may move the latch plate along thesliding axis so that the bar is aligned with the latching pathway. Thesecond disengagement force may be sufficiently large to compress thebias member. The second disengagement force may increase as the barmoves along the prescribed motion, the arcuate movement or both. Thesecond disengagement force may move the latch plate from a home positionto an unlocked position where the bar may separate from the latch unit.

FIG. 1 illustrates a top perspective view of an electrosurgical device 2that is configured as forceps 10. The electrosurgical device 2 includesa handpiece 4 that is attached to a movable member 12 and a groundmember 14. The movable member 12 is a first working arm 20 including afirst jaw 16 and the ground member 14 is a second working arm 22including a second jaw 18. A closure assembly 40 assists in maintainingthe first working arm 20 and the second working arm 22 in a closed statewhen the closure assembly 40 is activated.

FIG. 2 is a rear perspective view of an electrosurgical device 2including a handpiece 4 and forceps 10. The forceps 10 include a firstworking arm 20 with a first jaw 16 and a second working arm 22 with asecond jaw 18. The handpiece 4 includes a closure assembly 40 thatprevents movement of the first working arm 20 and the second working arm22 by locking the movable member 12 and the ground member 14 in aposition. The movable member 12 is a trigger 24 and the ground member 14is a handle 26.

FIG. 3A illustrates a laterally bisected perspective view of ahandpiece. A closure assembly 40 includes the latch unit 51 and amovement unit 50. The movement unit 50 includes a trigger 24, a bar arm42, and a bar 44. The bar 44 is fixed to the bar arm 42, which is fixedto the trigger 24. The latch unit 51 includes a bias member 54, anadjustment switch 56, a latch plate 70, a hook latch 60, and a wallguide 81. The latch plate 70 includes a guide aperture 52, which isconfigured to accept a connection pin 28 fixed to the handle 26.Further, the hook latch 60 and a wall guide 81 are fixed to the latchplate 70.

FIG. 3B illustrates a laterally bisected perspective view of the handle4 including a closure assembly 40 having a latch unit 51 and a movementunit 50. The movement unit 50 includes a trigger 24 with a bar arm 42and a bar 44 extending form the bar arm 42 with the bar 44 being alignedwith a latching pathway 32 of the latch unit 51 that is formed in thehandle 26. The latching pathway 32 includes a bar pathway 32A thatallows the bar to extend into the latch unit 51 and a bar arm pathway32B that is shallower than the bar pathway 32A and permits the bar arm42 to extend into the latch unit 51. The latch unit 51 includes aselection plate 55 with an adjustment switch 56 that extends out of thehandle through a compression stop 59 that restricts movement of the biasmember 54.

FIG. 4 illustrates a close-up, laterally bisected perspective view ofthe latch unit 51 in a lockable state 148 so that the movement unit 50is aligned with the latch unit 51. The adjustment switch 56 is movablealong a switch path 58 selectively between the lockable state 148 to anunlockable state (not shown). The handle 26 includes a forward stop 36and a backward stop 38, which define the boundaries of the latch unit's51 movement along the switch path 58. The adjustment switch 56 isconnected to the bias member 54 and latch plate 70 so that the latchplate 70 is movable along a latch plate path 72 by the guide aperture 52sliding along the connection pin 28.

FIG. 5A illustrates a laterally bisected, perspective view of the latchunit 51 in the lockable state 148 where the latch unit 51 is located adistance (D) from the latching pathway 32. An aperture 30 is formed inthe handle 26 and is configured to accept the bar 44 of the trigger 24.When pressure is applied to the trigger 24 of the movement unit 50, thetrigger 24 moves along an arcuate trigger path 130 into the aperture 30and reaches a terminus as the trigger 24 contacts the sidewall 34, whichas shown acts as a trigger stop 29. The bar 44 moves along an arcuatelocking path 120 from a home position 100, through the latching pathway32, and contacts the hook latch 60, imparting an engaging force FU onthe hook latch 60. The engaging force FU results in movement of the hooklatch 60 and latch plate 70 along a connection pin 28 that extends intothe guide aperture 52. As the bias member 54 moves from the engagingforce FU being applied to the hook latch 60 energy is stored in the biasmember 54.

FIG. 5B illustrates a laterally bisected, perspective view of the latchunit 51 in an unlockable state 160. In the unlockable state 160, thelatch plate 70 and hook latch 60 are located a distance (D′) away fromthe latching pathway 32 and the bar 44 so that when pressure is appliedto the movement unit 50, the trigger 24 moves along the arcuate triggerpath 130 into the aperture 30 and the bar 44 is either stopped beforereaching the hook latch 60 as the trigger 24 contacts the sidewall 34 orthe bar 44 moves along the arcuate locking path 120 and passes by thehook latch 60 without contacting the hook latch 60 so that the trigger24 freely moves between a home position 100 and a closed position thatis not locked. An angle (a) is located between the latch plate 70 andthe forward stop 36.

FIG. 6A illustrates a close-up view of the latch unit 51 and latch plate70 in the lockable state 148. When pressure is applied to the trigger(not shown) the bar 44 moves from the home position 100, along thearcuate locking path 120, and contacts an entry portion 62 of the latchplate 60 thereby applying the engaging force FU to the hook latch 60.The engaging force FU causes the bias member 54 to lengthen and increasein potential energy stored within the bias member 54. As the bar 44travels along the path 122, the hook latch 60 continues to move in thedirection of the engaging force FU and the potential energy of the biasmember 54 increases until the bar 44 passes an entry apex 84 from anunlocked state 152 to a locked state 150. Once past the entry apex 84,the bar 44 moves along a path 124 and contacts a guide wall 89 and guideapex 92 of the wall guide 81 until the bar 44 settles into a pocket,creating a locked state 150, that is formed by a curved portion of thehook latch 60. Once the bar 44 is past the entry apex 84 and pressure isreleased from the trigger (not shown), the bias member 54 moves the hooklatch 60 in a direction opposite the direction of the engaging force FUso that the bar 44 moves along path 124 into the curved portion 64,which prevents the bar 44 and trigger (not shown) from being moved.

FIG. 68 illustrates a close-up view of the latch unit 51 in the lockablestate 148. When pressure is applied to the trigger (not shown), the bar44 travels along the rear wall 94 and the path 126 where the bar 44moves from a locked state 150 the pocket 80 along a rear wall 81 andpast an exit apex 86 to an unlocked state 152. When pressure is releasedfrom the trigger (not shown), the bar 44 applies a disengaging force FDagainst a return portion 66 of the hook latch 60, causing the potentialenergy of the bias member 54 to increase by shortening the bias member54. The disengaging force FD persists as the bar 44 moves along anarcuate release path 128 until the bar 44 passes a release apex 90 andmoves to the home position 100.

FIG. 7A illustrates a close-up view of the adjustment switch 56 in thelockable state 148. The bias member 54 includes a detent pin 78 that islocated within a lockable state detent 76 so that the adjustment switch56 is locked in place relative to the handle 26. The handle 26 alsoincludes an unlockable state detent 74.

FIG. 7B illustrates a close-up view of the adjustment switch 56 movedfrom the lockable state detent 76 to the unlockable state detent 74 sothat an unlockable state 160 is formed. The bias member 54 includes adetent pin 78 that is located within the unlockable state detent 74 toretain the adjustment switch 56 relative to the handle 26. Theadjustment switch 56 is located proximate to the backward stop 38, whichprevents the detent pin 78 from overrunning the unlockable state detent74

Any numerical values recited herein include all values from the lowervalue to the upper value in increments of one unit provided that thereis a separation of at least 2 units between any lower value and anyhigher value. As an example, if it is stated that the amount of acomponent or a value of a process variable such as, for example,temperature, pressure, time and the like is, for example, from 1 to 90,preferably from 20 to 80, more preferably from 30 to it is intended thatvalues such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 etc. are expresslyenumerated in this specification. For values which are less than one,one unit is considered to be 0.0001, 0.001, 0.01 or 0.1 as appropriate.These are only examples of what is specifically intended and allpossible combinations of numerical values between the lowest value andthe highest value enumerated are to be considered to be expressly statedin this application in a similar manner.

Unless otherwise stated, all ranges include both endpoints and allnumbers between the endpoints. The use of “about” or “approximately” inconnection with a range applies to both ends of the range. Thus, “about20 to 30” is intended to cover “about 20 to about 30”, inclusive of atleast the specified endpoints.

The disclosures of all articles and references, including patentapplications and publications, are incorporated by reference for allpurposes. The term “consisting essentially of” to describe a combinationshall include the elements, ingredients, components or steps identified,and such other elements ingredients, components or steps that do notmaterially affect the basic and novel characteristics of thecombination. The use of the terms “comprising” or “including” todescribe combinations of elements, ingredients, components or stepsherein also contemplates embodiments that consist essentially of theelements, ingredients, components or steps. By use of the term “may”herein, it is intended that any described attributes that “may” beincluded are optional.

Plural elements, ingredients, components or steps can be provided by asingle integrated element, ingredient, component or step. Alternatively,a single integrated element, ingredient, component or step might bedivided into separate plural elements, ingredients, components or steps.The disclosure of “a” or “one” to describe an element, ingredient,component or step is not intended to foreclose additional elements,ingredients, components or steps.

It is understood that the above description is intended to beillustrative and not restrictive. Many embodiments as well as manyapplications besides the examples provided will be apparent to those ofskill in the art upon reading the above description. The scope of theteachings should, therefore, be determined not with reference to theabove description, but should instead be determined with reference tothe appended claims, along with the full scope of equivalents to whichsuch claims are entitled. The disclosures of all articles andreferences, including patent applications and publications, areincorporated by reference for all purposes. The omission in thefollowing claims of any aspect of subject matter that is disclosedherein is not a disclaimer of such subject matter, nor should it beregarded that the inventors did not consider such subject matter to bepart of the disclosed inventive subject matter.

1. (canceled)
 2. A closure assembly for a surgical device comprising: a movement unit including a bar that moves in a direction of a prescribed motion; and a latch unit including a hook latch that selectively receives the bar, the hook latch being movable between a first state and a second state.
 3. The closure assembly of claim 2, wherein the hook latch is movable in the direction of the prescribed motion.
 4. The closure assembly of claim 3, wherein the latch unit further includes a latch plate.
 5. The closure assembly of claim 4, wherein the hook latch extends from a surface of the latch plate.
 6. The closure assembly of claim 5, wherein the latch plate includes a guide aperture and the latch plate is pivotable about the guide aperture.
 7. The closure assembly of claim 6, wherein the latch plate is movable longitudinally along the guide aperture.
 8. The closure assembly of claim 6, wherein the guide aperture is elongated and has a longitudinal dimension that is greater than a lateral dimension.
 9. The closure assembly of claim 6, wherein the guide aperture receives a connection pin of the surgical device.
 10. The closure assembly of claim 3, wherein the first state is a lockable state where the hook latch is engageable by the bar of the movement unit.
 11. The closure assembly of claim 10, wherein the second state is an unlockable state where the bar does not reach the hook latch or the hook latch is moved out of alignment with the prescribed motion so that the hook latch is not engaged by the bar.
 12. The closure assembly of claim 2, further comprising an adjustment switch that is operable to move the hook latch between the first state and the second state.
 13. The closure assembly of claim 12, further comprising a biasing member positioned between the hook latch and the adjustment switch.
 14. A closure assembly for a surgical device comprising: a movement unit including an engagement member that moves in a direction of a prescribed motion; and a latch unit including a latch plate including a hook latch that selectively receives the engagement member, the latch plate being movable between a first state and a second state.
 15. The closure assembly of claim 14, wherein the latch plate is movable in the direction of the prescribed motion.
 16. The closure assembly of claim 14, wherein the latch plate includes a bias member comprising a deformable body.
 17. The closure assembly of claim 14, wherein the latch plate includes a guide aperture that receives a connection pin of the surgical device.
 18. The closure assembly of claim 17, wherein the latch plate is pivotable about the guide aperture and movable longitudinally along the guide aperture.
 19. The closure assembly of claim 14, further comprising an adjustment switch that moves the latch plate between the first state and the second state.
 20. A closure assembly for a surgical device comprising: a movement unit including a bar that moves in a direction of a prescribed motion; and a latch unit including a latch plate including a guide aperture and a hook latch that selectively receives the bar, the latch plate being pivotable about the guide aperture and movable in the direction of the prescribed motion between a lockable state and an unlockable state.
 21. The closure assembly of claim 20, wherein the latch plate is translatable along the guide aperture.
 22. The closure assembly of claim 39, wherein the latch plate includes one or more bias members. 